<template>
    <div>
        <!-- 面包屑导肮区域 -->
    <el-breadcrumb      separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert title="注意：只允许为第三级分类参数设置相关参数" type="warning" :closable="false" show-icon></el-alert>
        <!-- 选择商品分类 -->
        <el-row class="cat_opt">
            <el-row>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                    v-model="selectedCateKeys"
                    :options="cateList"
                    :props="{ expandTrigger: 'hover',value:'cat_id',label:'cat_name',children:'children'}"
                    :collapse-tags="true"
                    @change="handleChanged"
                    clearable>
                </el-cascader>
            </el-row>
        </el-row>
        <!-- tab页签 -->
        <el-tabs v-model="activeName" @tab-click="handleClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数的表格 -->
                <el-table :data="manyTableData" border stripe="">
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag -->
                            <el-tag v-for="(item ,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                            <!--输入文本框-->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" label="#"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDiolog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete"
                            size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                <!-- 静态属性的表格 -->
                <el-table :data="onlyTableData" border stripe="">
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag -->
                            <el-tag v-for="(item ,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                            <!--输入文本框-->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" label="#"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDiolog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete"
                            size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="30%"
        @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取消</el-button>
        <el-button type="primary" @click="addParams">确定</el-button>
        </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="30%"
        @close="editDialogClosed">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取消</el-button>
        <el-button type="primary" @click="editParams">确定</el-button>
        </span>
    </el-dialog>
    </div>
</template>
<script>
export default {
    data() {
        return {
            //商品分类列表
            cateList:[],
            //级联选择框双向绑定的数组
            selectedCateKeys:[],
            //被激活的页签的名称
            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            //静态属性的数据
            onlyTableData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible:false,
            //添加对话框的表单数据对象
            addForm:{
                attr_name:''
            },
            //表单的验证规则
            addFormRules:{
                attr_name:[
                    { required: true, message:'请输入添加的商品属性不能为空', trigger: 'blur'}
                ]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible:false,
            //修改的表单数据对象
            editForm:{},
            //修改按钮的表单验证规则对象
            editFormRules:{
                attr_name:[
                    { required: true, message:'请输入添加的商品属性不能为空', trigger: 'blur'}
                ]
            }
        }
    },
    created() {
        this.getCateList()
    },
    computed: {
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3 ){
                return true
            }
        },
        //当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态的设置标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    },
    methods: {
        //获取商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败')
            }
            //把数据列表赋值给cateList
            this.cateList = res.data
        },
        //级联选择框发生变化，触发该事件
        async handleChanged(){
            this.getParamsData()
        },
        //tab页签点击事件被激活的处理事件
        handleClick(){
            this.getParamsData()
        },
        //获取参数的列表数据
        async getParamsData(){
             //证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            //根据选中的id 和当前所处的面板，获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})

            if(res.meta.status !== 200){
                return this.$message.erroe("获取数据失败")
            }
            res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
                    //控制文本框的显示与隐藏
                    item.inputVisible = false
                    //文本框中输入的值
                    item.inputValue = ''
            });
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        //监听对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
            // this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,
                attr_sel:this.activeName})
                if(res.meta.status !== 201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                this.getParamsData()

            })
        },
        //编辑按钮的对话框
        async showEditDiolog(attrId){
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`,{params:{attr_sel:this.activeName}})

            if(res.meta.status !== 200){
                return this.$message.error('获取表单数据失败')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        //监听编辑对话框的关闭事件
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮，修改参数
        editParams(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,
                attr_sel:this.activeName})
                if(res.meta.status !== 200){
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.editDialogVisible = false
                this.getParamsData()

            })
        },
        //根据id删除
        removeParams(attrId){
            this.$confirm("此操作将永久删除该参数, 是否继续?", "提示", {
                confirmButtonText: "确定",
                cancelButtonText: "取消",
                type: "warning"
            })
            .then(async ()=> {
                //删除的逻辑接口
                const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
                if(res.meta.status !== 200){
                this.$message.error('删除参数失败，请重新删除')
            }

            this.$message({
                type: "success",
                message: "删除成功!"
            });
            this.getParamsData()
            })
            .catch(() => {
                this.$message({
                type: "info",
                message: "已取消删除"
                });
            });
        },
        //文本框失去焦点或按下enter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return 则证明输入的内容需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            //需要发起请求保存这次操作
            this.saveAttrVals(row)
        },
        //将对attr_vals的操作保存
        async saveAttrVals(row){
             //需要发起请求保存这次操作
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(',')})

            if(res.meta.status !== 200){
                return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功')
        },
        //点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible = true
            //让文本框自动获取焦点
            //$nextTick 方法作用：当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //删除对应的参数可选项
        handleClosed(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
}
</script>
<style lang="less" scoped>
.cat_opt{
    margin: 25px 0
}
.el-tag{
    margin: 10px
}
.input-new-tag{
    width: 130px
}
</style>